Every rep timed.Reps left, estimated.
Point your phone at the rack. CernoFit times every rep, notices when you slow down, and estimates how many more reps you could have done. Lifters call that number reps in reserve, or RIR. Then it writes your next set from what actually happened, not from a guess.
Follow one example set from what the camera sees to what you lift next.
Static example · reduced motionMeasured
The camera times the lifting part of every rep. Solid, full-contrast numbers are things it saw.
Estimated
2 reps left
Range 1–3 · medium confidence
How much you slowed down becomes a range of reps you had left (reps in reserve), with a stated confidence. Purple numbers are things it worked out.
Decided
This set: 310 lbs × 5
310 lbs × 5
Next set: same weight.
The estimate matches the target of 2 reps left.
When the estimate says you had room, the next set gets heavier. When it says you were over, the weight holds. One line of why, every time.
Your weight follows your effort.
Nine weeks of back squat in a made-up example plan. The weight goes up only when your estimated effort showed you had room, and it waits until a lighter “deload” week is over. Week four of each wave is that deload week: the weight holds and the effort eases off.
See every set in the planFor lifters who push hard sets, at any level.
It matters most in the last few reps of a hard set. If you always stop with plenty left, a simple log is enough. If your sets end in a grind and you still write “2 reps left” in your notes, this is the missing piece.
Free while invite‑only. Paid later.
Everyone on the list gets an invite. One email when yours is ready.